5215561 has 8 divisors (see below), whose sum is σ = 5709704. Its totient is φ = 4734720.

The previous prime is 5215559. The next prime is 5215579. The reversal of 5215561 is 1655125.

It can be written as a sum of positive squares in 4 ways, for example, as 291600 + 4923961 = 540^2 + 2219^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 5215561 - 2¹ = 5215559 is a prime.

It is not an unprimeable number, because it can be changed into a prime (5215061) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2496 + ... + 4081.

It is an arithmetic number, because the mean of its divisors is an integer number (713713).

Almost surely, 2^5215561 is an apocalyptic number.

It is an amenable number.

5215561 is a deficient number, since it is larger than the sum of its proper divisors (494143).

5215561 is a wasteful number, since it uses less digits than its factorization.

5215561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6651.

The product of its digits is 1500, while the sum is 25.

The square root of 5215561 is about 2283.7602763863. The cubic root of 5215561 is about 173.4204636730.

It can be divided in two parts, 5215 and 561, that added together give a square (5776 = 76²).

The spelling of 5215561 in words is "five million, two hundred fifteen thousand, five hundred sixty-one".